Serial number for 76 KZ900 LTD

Did any KZ900s have a serial number that started with KZ900 XXX XXX? There's one on Ebay that shows the title with a Vin KZ900B503585. I've never heard of a KZ900 with a serial number that didn't start with Z1F. The bike looks like an abortion mix mash of parts from various bikes thrown together... but the title doesn't seem right on top of all that.

Source zedder.com

www.zedder.com/Info/76%20KZ900-B1%20LTD.htm

'76 KZ900-B1:LTD
Frame No. Range KZ900B-500011 - 505514
Engine No. Range Z1E086001 - 117973

Engine serial numbers on Z1/KZ 900's began with Z1E. (for engine) Serial numbers on Z1's began with Z1F (for frame) Frame serial numbers on KZ900's began with KZ900. From there they were either an "A" model (standard) or "B" model (LTD) The rest of the serial number would normally be six digits. If the bike was made in North America the digits began with 5 followed by five more digits. All of the B models were made in North America.